first of all, when touring with a group you should feel free to speak you mind about the conditions and what you are uncomfortable with. if you can't do that then you should go with a different group. i like the idea of everyone being a group leader. route decisions are discussed and accepted by everone before we go. if one person says no go then we reassess the situation and find a route that everyone is comfortable with. that said, what determines what you are comfortable with? for me it is the consequences. what will happen if i fall? what will happen if it slides? if there is any questionable instability in the slope you need to think of what is below you. whether the avalanche comes from above or right where you are at you are likely headed down the fall line. if there is a cliff band then the consequences climb. trauma kills around a quarter of all avalanche victims. by putting yourself in a position to be swept off a cliff or through rocks/tree then you just raised your chances of dying from trauma. shallow snow packs have terrain features that may be hidden under the snowpack. these features may become a giant pinball field for a body in an avalanche. trees become baseball bats at around 20+ mph (~3.5 seconds in a slide) and likely areas to be buried deeply as the tree stops both you and the following snow stacks up. on an open slope you may have an abrupt change in slope angle at the bottom the snow will pile up very deep and quickly. no amount of swimming can prevent you being buried once you reach this portion of the runout. the same is true for a small cliff to flat transition. these are terrain traps. there are other types but the most notable is a gully. when looking down the slope do you see a place where all the snow will funnel? a chute or gully may be a good place to ski usually but not when you could be funneled down one and burried. on a large slide path that ends in a flat gully you could be buried 40+ feet deep with no chance of rescue. how about just traveling through a small gully with snow on the sides somewhere in the flats. if those sides are high enough and the snow can slide it can bury you very deeply. usuing one as a test slope should be done with caution.
there are a lot of times when you aren't quite sure about the stability. you may decide to ski anyway if the consequences aren't that high. you should always have a planned path out if something breaks. i usually ski cut the slope a few times before i commit. this works well for soft slabs and point release but is ineffective on hard slabs. know what you are dealing with. it is part of the risk. if a hard slab breaks on you, you will likely be already far onto it with much snow above you. it will break into chunks and you will have no chance to ski off of it after the initial seconds. a hard slab itself without rocks, trees or cliffs can kill you from trauma. don't mess with them.
picture from a colorado avy:
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hard slab avy debris. notice the chunks still in the debris. imagine trying to ski that while it is still moving down slope.:
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photo by hacksaw:
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